geaham



(No Model.)

2`Sheets-Sheet 1. T. W. GRAHAM. ROLLER GRINDING MILL. No. 434.707.

Patented Aug. 19, 1890.

g 4f/5mg T. W. GRAHAM. LLBR GRINDING M Patented Aug. 19, 1890.

UNITED STATES PATENT OEEIc'E..

' THOMAS WILLIAM` GRAHAM, or DUEUQUE, IOWA", AssIGNoR or 'rw o-T HIRDS To E. II. wILLIAMs AND E. THOMELY, BOTH or SAME PLACE,

SPECIFICATION forming part of Letters Iatent No. 434,707, dated August 19, 1890.

Application tiled May 31, 1890.' Serial No. 353,878. (No model.)

To all whom, it may concern:

Be it known that I, THOMAS WILLIAM GRA- HAM, a citizen of the United States,residing at Dubuque, in the county of Dubuque and State of Iowa, have invented certain new and useful Improvements in Roller Grinding-Mills;

andI do hereby declare the following to be a full, clear, and exact` description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in roller grinding-mills; and it consists in the construction and arrangement of parts hereinafter described, and denitely pointed out in the claims.

The object of my invention is to provide an improved means for adjusting and aligning the rolls relatively to each other in a simple and eective manner. I attain this object by the construction illustrated in the accompanying drawings, wherein like letters of reference indicate corresponding'parts in the several views, and in which- Figure 1 is an end elevation of the device,

showing part of the same in section. Fig. 2 is a perspective View of part of a mill with my attachment.

In the drawings, A represents the frame, and B the fixed roll journaled therein in any suitable manner. In the frame below the fixed roll is formed a recess or bearing-pocket C, having straight upper and* lower walls. Through the rear walls of this pocket is formed a threaded aperture in which is a horizontallymovable adjusting-rod D, having a hand-wheel on its0uter,end,for the purposes hereinafter stated.

E represents the adjustable roll journaled in a supporting-frame F in any suitable manner.

Extending out from the lower par-t of the frame F to a point beyond the periphery of the roll E is an arm G, having a spherical or ball-shaped bearing H formed on its end, the diameter of which is such 'as to admit of its being inserted in the pocket formed in the frame, which acts as a seat therefor, in which it has a horizontal and oscillating play, thus allowing a vertical and horizontal adjustment ofthe roll E, the horizontal adjustment being acquired by movement of the adjustingrod D, which has a seat d on its end which bears against the bearing H.

Topreventinjuryto the rolls by the presence of hard foreign substances, I form a pendent arm K on`the frame F, against the outer face of which bears the knife-edged head of ahorizontally-disposed rod L, the apex Y bearing against the arm K. The rodL passes through an aperture I in the frame, and has a collar I', movably held on its outerend by an adj usting-nutI2 on the end of the rod. A coiled spring M is sleeved on the rod L, between the frame and the collar I so thatgthe movement of the collar by the nut I2 regulates the tension of the spring.

The vertical adjustment and spreading of 'the roll E is effected by an arm or lever N,

mounted on a shaft in the frame above the rolls, and by adjusting-nuts O O', placed, re-

spectively, above and below the outer end of frame F, on a pitman P, which passes through an aperture in the end of the frame. The upper end of the pitman P is eccentrically connected with lever N, so that the upward movement of the latter spreads the rolls apart, and moving the same down forces the rolls together, and also increases and decreases the tension of the spring M.

By the above construction it will be noted that the adjustable roll will be permitted a' vertical, horizontal, and tilting movement to compensate for the wear of the journals, the spherical arm and bearing acting as ball-andsocket connection, the ballhavin g ahorizontal as well as rotary movement, as stated.

It will of course be understood that a nurnber of Ysets of rolls may be employed in lieu The ar- IOO I am aware that many minor changes in the construction and arrangement of parts of my device can be made and substituted for those shown and described without in the least departing from the nature and principle of my invention.

Having thus described my invention, whatI claim, and desire to secure by Letters Patent, 1s

1. In aroller-mill, the combination, with a fixed roll, of an adjustable roll having spherical bearings extending laterally beyond its axis, rests for said bearings, means for adj ust` ing the bearings horizontally, and tension devices below the bearings, substantially as described.

2. In a roller-mill, the combination,with the casing and a fixed roller, of a rest below the roller, an adjustable rollerhaving a forwardly-extending spherical bearing supported in said rest, an adjustable rod impinging against said bearing for moving the same horizontally, and tension devices below the bearing, substantially as described.

3. In a roller-mill, the combination, with a frame and a fixed roll, of an adjustable roll, a frame extending laterally beyond the periphery of the adj usting-roll supporting the same,

spherical bearings on the frame, means for adjusting the frame vertically and horizontally, and tension devices secured to the casing below the bearing and engaging With the lower end of the adjustable frame, substantially as described.

4. In a roller-mill, the combination, with a fixed roll, of an adjustable roll, bearings for said adjustable roll extending laterally beyond its'axis and constructed to allow a movement in horizontal and vertical planes, rests for said bearings, means for adjusting the bearings horizontally in the rests, and tension devices below the bearings, substantially as described.

5. In a roller-mill, au adjustable grindingroll having spherical bearings extending laterally beyond its axis, means for adjusting the bearings horizontally, and ten sion devices consisting of a rod having a knite-edged end bearing against the bearing and a spring on the rod, substantially as described.

In testimony whereot' I aiiix 1n y signature in pressure of two witnesses.

THOMAS WILLIAM GRAI-IAl\.

Witnesses:

J. C. LQNGUEVILLE, T. H. DUFFY. 

